Definition of Abraham's balm in English:

Abraham's balm

noun

historical
literary
  • The chaste tree, Vitex agnus-castus (family Verbenaceae); (also) any of various parts of this plant used medicinally; also called agnus castus.

Origin

Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. Apparently from the genitive of Abraham + balm; perhaps compare German Abrahamsbaum chaste tree, lit. ‘Abraham's tree’, although the semantic motivation of either the English or the German word is unclear.